Determine the reactions on the bent rod

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Determine the reactions on the bent rod which is
supported by a smooth surface at B and by a collar at A,
which is fixed to the rod and is free to slide over the fixed
inclined rod.

[@sonicfluffy1]

Why is NB in the X direction positive? It's counterclockwise according to the right hand rule

[@BroodyQuil]

Oh, I didn't realize we still used the moment about A from the collar even when we calculate all the moments relative to A. Thanks!

[@seanhedgecock6327]

Taking statics over the summer. This helps a ton! Thank you.

[@bhumipatel5634]

How exactly did you convert the triangular components 4, 3, 5 at A @ 0:39

[@ryan355]

Thank you! Studying for a test and this helps walk me through it again!

[@SalmaMohamed-cv4ox]

Where point A is located, how do you determine the direction of the vector components when the resultant line is drawn? does it matter what direction you pick the Ax and Ay to go in if given no guidance or line of reference in a problem? For example, I had a problem similar to this one except that I did not have that line next to A with the 3-4-5 triangle so I had to draw my own x and y component but was not sure if it matters if I draw it to the left or to the right (up or down) and how to know when Ax is left or right etc.

[@かっテャン]

Thank you very much, you always save my life

[@brianramz6681]

at 2:21 why dont we multiply 200 by 6 ft?

[@europeankid98]

If you know that the moment at A is 0, why do you have to solve for Nb using other equations? Why can't you solve for Nb using the first equation if the moment at A is 0?

[@europeankid98]

@@yousefhammad9858 yeah so I think I know why. It’s the SUM of the moments at A = 0, that doesn’t necessarily mean that the induced moment at A = 0 from the collar.

[@sarahmartinez6935]

Thank you so so much i finally understand why all my answers were wrong.... i kept forgetting the inversion for the triangle

[@hunterbrooks6359]

Thank you so much for this!

[@jortmatti8689]

not the hero we want, but the hero we need!

[@daprimo00]

since the 200lb is turning clockwise, shouldn't it be a NEGATIVE and not a positive value?

[@chad_from_the_book5788]

you can set either clockwise or counterclockwise motion as positive or negative, as long as your convention remains the same throughout the entire problem (i.e. if you decided clockwise is positive and get a positive answer, then that answer is clockwise)

[@sjaoenvf]

why is clockwise positive?

[@naturenuerologist8396]

First of all I appreciate you and thanks you for making these videos.But unfortunately Chapter 5 and after that is not posted . I recommend you to make new videos of chapter 5 full videos and also other chapters Thank you

[@dannycelis7854]

why dont we take the normal for a like we did for b for the moment?

[@farisoqdeh6228]

Why did u include MA in the equation?

[@observer4322]

That's my question too.

[@farisoqdeh6228]

@@observer4322 Bcz MA is not 0 but the net moment MA is zero so there should be a moment MA to balance the equation.

[@farisoqdeh6228]

My comment is 11 months old, hope that helps!

[@observer4322]

@@farisoqdeh6228 It does kinda. I asked a fellow student today about it as well and it is understandable, yet I am still missing something about it for it to feel intuitave, but I will keep digging and continue to meditate on what you and others have said. Thanks responding

[@observer4322]

~~And actually the more I think about it, the more it makes sense. I get that M_a overall (net) is zero, but M_a also has a moment. I think I'm understanding. Thanks again.

[@adrikaafrin]

cant the collar roate about A? why do we moment about A?

[@abdulazizf661]

thanks a lot man

[@luckyim6504]

thank you

[@astarothgremory6816]

A question, why if you chose your point of reference in B did not cancel your moment in B? because if you choose your point of reference in A, the moment in A disappears, and so in vice versa

[@nyiacarter7379]

there is no moment created at b because it is a smooth support. At point A there is a collar support which creates a moment.

[@andrewgariando4036]

he teaches this one but it is so hard to understand. he's good at solving but weak jn teaching

[@fatimatiago8434]

This one: i.imgur.com/Wb8uB04.png

[@CXT300]

Thank you